Call Forwarding Pay Per Use

I don't have Call Forwarding set up on my plan as a calling feature, but I would like to make use of this service temporarily. It says online that the cost is 95c / per use with a monthly cap of $4.95. Does this mean that the charge is incurred per forwarded call or per each instance I forward, then unforward? What happens if I forward all calls today and unforward them a week from today? Is that a 95c charge or more for the extra days it's forwarded?